Marianne Ayala/Insider Asset managers are building new products to satisfy growing investor demand for cryptocurrencies. Crypto's high carbon emissions are a "stumbling block" for some, one exec told Insider. Here's a look at how different asset managers are addressing those concerns. US investors are hungry for cryptocurrency, evidenced by bitcoin's rapid rise to a market capitalization of more than $1 trillion and the crypto giant Coinbase's recent initial public offering, which blew investors' expectations away. In addition, the US Securities and Exchange Commission is reviewing at least nine applications for the first domestic crypto exchange-traded fund. As asset managers build new products to satisfy the growing demand for crypto, they could have to reckon with another trend popular among some investors — sustainability. Bitcoin notoriously consumes more energy than Argentina due to its onerous mining process, and its energy use is only going up, according to a study from Cambridge's Centre for Alternative Finance